/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pig.newplan.logical.visitor;
import org.apache.pig.PigException;
import org.apache.pig.SortInfo;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.plan.VisitorException;
import org.apache.pig.newplan.DependencyOrderWalker;
import org.apache.pig.newplan.Operator;
import org.apache.pig.newplan.OperatorPlan;
import org.apache.pig.newplan.logical.expression.ConstantExpression;
import org.apache.pig.newplan.logical.expression.LogicalExpressionPlan;
import org.apache.pig.newplan.logical.relational.LOLimit;
import org.apache.pig.newplan.logical.relational.LOSort;
import org.apache.pig.newplan.logical.relational.LOSplit;
import org.apache.pig.newplan.logical.relational.LOSplitOutput;
import org.apache.pig.newplan.logical.relational.LOStore;
import org.apache.pig.newplan.logical.relational.LogicalRelationalNodesVisitor;
public class SortInfoSetter extends LogicalRelationalNodesVisitor {
public SortInfoSetter(OperatorPlan plan) throws FrontendException {
super(plan, new DependencyOrderWalker(plan));
}
@Override
public void visit(LOStore store) throws FrontendException {
Operator storePred = store.getPlan().getPredecessors(store).get(0);
if(storePred == null){
int errCode = 2051;
String msg = "Did not find a predecessor for Store." ;
throw new VisitorException(store, msg, errCode, PigException.BUG);
}
SortInfo sortInfo = null;
if(storePred instanceof LOLimit) {
storePred = store.getPlan().getPredecessors(storePred).get(0);
} else if (storePred instanceof LOSplitOutput) {
LOSplitOutput splitOutput = (LOSplitOutput)storePred;
// We assume this is the LOSplitOutput we injected for this case:
// b = order a by $0; store b into '1'; store b into '2';
// In this case, we should mark both '1' and '2' as sorted
LogicalExpressionPlan conditionPlan = splitOutput.getFilterPlan();
if (conditionPlan.getSinks().size()==1) {
Operator root = conditionPlan.getSinks().get(0);
if (root instanceof ConstantExpression) {
Object value = ((ConstantExpression)root).getValue();
if (value instanceof Boolean && (Boolean)value==true) {
Operator split = splitOutput.getPlan().getPredecessors(splitOutput).get(0);
if (split instanceof LOSplit)
storePred = store.getPlan().getPredecessors(split).get(0);
}
}
}
}
// if this predecessor is a sort, get
// the sort info.
if( storePred instanceof LOSort ) {
sortInfo = ((LOSort)storePred).getSortInfo();
}
store.setSortInfo(sortInfo);
}
}